SBVS129A May   2009  – July 2018 TLC5952

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
    1.     Device Images
      1.      Typical Application Circuit (Multiple Daisy-Chained TLC5952s)
  4. 4 Revision History
  5. 5 Pin Configuration and Functions
    1.     Pin Functions
  6. 6 Specifications
    1. 6.1 Absolute Maximum Ratings
    2. 6.2 ESD Ratings
    3. 6.3 Recommended Operating Conditions
    4. 6.4 Thermal Information
    5. 6.5 Electrical Characteristics
    6. 6.6 Switching Characteristics
    7. 6.7 Typical Characteristics
  7. 7 Parameter Measurement Information
    1. 7.1 Pin Equivalent Input and Output Schematic Diagrams
    2. 7.2 Test Circuits
  8. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1 Maximum Constant-Sink-Current Value
      2. 8.3.2 Global Brightness Control (BC) Function: Sink-Current Control
      3. 8.3.3 Constant-Current Output On-Off Control
    4. 8.4 Device Functional Modes
      1. 8.4.1 LOD, LSD, and TEF Operation
      2. 8.4.2 Register and Data Latch Configuration
        1. 8.4.2.1 Output On-Off Data Latch
        2. 8.4.2.2 Control-Data Latch
        3. 8.4.2.3 Status Information Data (SID)
        4. 8.4.2.4 LED-Open Detection (LOD), LED-Short Detection (LSD), And Thermal Error Flag (TEF)
        5. 8.4.2.5 Thermal Shutdown (TSD)
        6. 8.4.2.6 Noise Reduction
  9. 9 Power Supply Recommendations
  10. 10Device and Documentation Support
    1. 10.1 Receiving Notification of Documentation Updates
    2. 10.2 Community Resources
    3. 10.3 Trademarks
    4. 10.4 Electrostatic Discharge Caution
    5. 10.5 Glossary
  11. 11Mechanical, Packaging, and Orderable Information

Package Options

Mechanical Data (Package|Pins)
Thermal pad, mechanical data (Package|Pins)
Orderable Information

8.3.1 Maximum Constant-Sink-Current Value

The maximum output current per channel, IOLCMax, is programmed by a single resistor, RIREF, which is placed between the IREF and GND pins. The voltage on IREF is set by an internal band-gap VIREF, with a typical value of 1.20 V. The maximum channel current is equivalent to the current flowing through RIREF multiplied by a factor of 40 for OUTRn, -Gn and 30 for OUTBn. The maximum output current per channel can be calculated by Equation 1.

Equation 1. TLC5952 q_riref_bvs129.gif

where

  • VIREF = the internal reference voltage on IREF (1.20 V, typical)
  • IOLCMax = 2 mA to 35 mA at OUTRn, -Gn and 1.5 mA to 26.2 mA at OUTBn

IOLCMax is the largest current for each output. Each output sinks the IOLCMax current when it is turned on and the global brightness control data are set to the maximum value of 7Fh (127d). Each output sink current can be reduced by lowering the output global brightness control (BC) value.

RIREF must be between 1.37 kΩ and 24 kΩ to hold IOLCMax between 35 mA (typ) and 2 mA (typ) for OUTRn, -Gn and between 26.2 mA (typ) and 1.5 mA (typ) for OUTBn. Otherwise, the output may be unstable. Output currents lower than 2 mA (or 1.5 mA for OUTBn) can be achieved by setting IOLCMax to 2 mA or higher and then using global brightness control to lower the output current.

Table 1 shows the characteristics of the constant-current sink versus the external resistor, RIREF.

Table 1. Maximum Constant-Current Output Versus External Resistor Value

IOLCMax (mA) RIREF (kΩ)
OUTRn, OUTGn OUTBn
35 26.28 1.37
30 22.5 1.6
25 18.75 1.92
20 15 2.4
15 11.25 3.2
10 7.5 4.8
5 3.75 9.6
2 1.5 24